Is Your GM Truck or SUV Running Rough?
If you’re dealing with a no-start condition, erratic engine behavior, or a persistent Check Engine Light on your 1998 Oldsmobile Bravada, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer, the PCM manages everything from fuel injection and ignition timing to transmission shifting. When it fails, it can cause a host of frustrating and hard-to-diagnose problems. This isn’t just an inconvenience; it affects your vehicle’s reliability, fuel economy, and safety. I’ve seen countless vehicles towed into my shop with these exact symptoms, and a faulty PCM is a common diagnosis.
This is a reliable, tested OEM PCM, part number 09355699, sourced from a salvaged vehicle. The real value here is our pre-programming service. Before we ship it, we flash the module with the latest official GM software updates, tailored specifically to your vehicle using the VIN you provide. This means you get a component that’s ready for installation right out of the box, saving you a costly trip to the dealership for programming.
A Technician’s Notebook: The Ghost in the Machine
I remember a 1998 GMC Jimmy with the 4.3L V6—mechanically identical to many Bravadas and S10s—that came in on a tow hook. The owner had replaced the fuel pump, spark plugs, and distributor, but it still wouldn’t start reliably. It had no spark, but only intermittently. After hours of chasing wires, we checked the PCM. It wasn’t throwing the typical P0601 internal failure code, but on a hunch, we connected a known-good PCM. The truck fired up instantly. The original PCM had a hairline crack in a solder joint that would separate when it warmed up, cutting power to the ignition system. This replacement 1998 Bravada PCM is the exact solution for these hard-to-find electrical gremlins.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is likely the solution you need. Keep an eye out for these common diagnostic trouble codes (DTCs): P0601, P0605, P0606, or various communication (U-series) codes.
- ✔ Check Engine Light is on for no apparent reason.
- ✔ Engine cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Noticeable drop in fuel economy.
- ✔ Stalling, sputtering, or misfiring while driving.
- ✔ Failure to communicate with a diagnostic scan tool.
A Straightforward Guide to Installation
Installing your pre-programmed PCM is a job most DIYers can handle in under an hour with basic hand tools. Our VIN-matching service eliminates the most difficult step—the programming.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most compatible vehicles like the Bravada, Blazer, or Jimmy, the PCM is located in the engine bay, often near the battery or on the fender wall. On vans like the Express or Savana, it’s typically in the rear of the engine compartment.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old PCM. These connectors have locking tabs; be gentle to avoid breaking them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you’ll need it for the new one.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely bolt it in place.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module until they click. Reconnect the negative battery terminal.
- Perform a Relearn (If Necessary): While not always required, some vehicles may need a security or crank position sensor relearn procedure. For many of these GM models, simply turning the key to the ‘ON’ position for 10-15 minutes is sufficient for the security system to sync with the new PCM.
Will This Fit My Vehicle?
We guarantee this module will function correctly if your original PCM has service number 09355699 or one of the interchangeable numbers listed below. This part is a direct fit for a wide range of GM trucks, vans, and SUVs. Please verify your part number before ordering.
Interchangeable Part Numbers: 16266645, 16250279, 16258815, 09366810, 9366810.
Compatible Models Include:
- ✔ 1998 Oldsmobile Bravada (4.3L)
- ✔ 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups (Gasoline)
- ✔ 1998-1999 Chevrolet Suburban & Tahoe / GMC Yukon (Gasoline)
- ✔ 1998-1999 Chevrolet Express & GMC Savana Vans (1500/2500/3500, Gasoline)
- ✔ 1998 Chevrolet S10 / GMC Sonoma (4.3L)
- ✔ 1998 Chevrolet Blazer / GMC Jimmy (4.3L)
- ✔ 1998 GMC Envoy (4.3L)
- ✔ 1998 Chevrolet Astro / GMC Safari (4.3L)
- ✔ 1999 Cadillac Escalade
- ✔ 1998 Isuzu Hombre (4.3L)
Frequently Asked Questions
Frequently Asked Questions
Do I need to do anything after I install this PCM?
Because we program the module to your VIN before shipping, it should be a plug-and-play installation. In some cases, a simple security relearn procedure (leaving the key in the ‘ON’ position for 10-15 minutes) may be necessary for the vehicle to start.
What information do you need from me?
After you complete your purchase, you MUST provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot program or ship your PCM without it.
Is this a new part?
No, this is a genuine OEM part that has been carefully removed from a salvaged vehicle. We test each unit to ensure it’s fully functional before programming and shipping.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the transmission’s shift points and line pressure. If the PCM is faulty, it can cause hard shifting, delayed shifting, or other transmission-related issues. However, you should always rule out mechanical transmission problems first.
How do I find my original part number?
The part number is printed on a sticker directly on your vehicle’s original PCM. You will need to locate the module in your engine bay to verify the number matches 09355699 or one of the compatible part numbers listed.